Direct effect of Pa(CO2) on respiratory sinus arrhythmia in conscious humans.

Direct effect of Pa(CO2) on respiratory sinus arrhythmia in conscious humans.
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Pa(CO2) 对清醒人呼吸性窦性心律失常的直接影响。

DOI:
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发表时间:
2002
期刊:
American Journal of Physiology. Heart and Circulatory Physiology
影响因子:
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通讯作者:
J. Fisher
J. Fisher
中科院分区:
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文献类型:
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作者:
N. Sasano;A. Vesely;J. Hayano;H. Sasano;R. Somogyi;D. Preiss;K. Miyasaka;H. Katsuya;S. Iscoe;J. Fisher

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呼吸性窦性心律不齐(RSA)可通过在每个呼吸周期内使肺血流量与肺容量相匹配来改善肺气体交换效率。如果是这样的话,肺气体交换需求的增加可能会增加RSA的幅度。因此,我们测试了这一假设,即即使在潮气量(V(T))和呼吸频率(F(B))的变化(间接影响RSA)被阻止时,CO2也会直接影响清醒人类的RSA。在7名健康受试者中,我们在恒定V(T)和F(B)下随机将潮气末PCO 2(PET(CO2))调整为30、40或50 mmHg。R-R间期变异高频成分的平均幅度被用作RSA幅度的定量评估。随着PET(CO2)的增加,RSA幅度逐渐增加(P < 0.001)。PET(CO2)为40和50 mmHg时,平均R-R间期无差异,但在30 mmHg时较小(P < 0.05)。由于V(T)和F(B)是恒定的,这些结果支持我们的假设,即增加CO2直接增加RSA幅度,可能是通过对产生RSA的髓质机制的直接影响。
Respiratory sinus arrhythmia (RSA) may improve the efficiency of pulmonary gas exchange by matching the pulmonary blood flow to lung volume during each respiratory cycle. If so, an increased demand for pulmonary gas exchange may enhance RSA magnitude. We therefore tested the hypothesis that CO2 directly affects RSA in conscious humans even when changes in tidal volume (V(T)) and breathing frequency (F(B)), which indirectly affect RSA, are prevented. In seven healthy subjects, we adjusted end-tidal PCO2 (PET(CO2)) to 30, 40, or 50 mmHg in random order at constant V(T) and F(B). The mean amplitude of the high-frequency component of R-R interval variation was used as a quantitative assessment of RSA magnitude. RSA magnitude increased progressively with PET(CO2) (P < 0.001). Mean R-R interval did not differ at PET(CO2) of 40 and 50 mmHg but was less at 30 mmHg (P < 0.05). Because V(T) and F(B) were constant, these results support our hypothesis that increased CO2 directly increases RSA magnitude, probably via a direct effect on medullary mechanisms generating RSA.
DOI: 10.1016/0735-1097(89)90408-7
发表时间: 1989-11-01
影响因子: 24
作者:
APPEL, ML;BERGER, RD;COHEN, RJ
通讯作者: COHEN, RJ
DOI: 10.1152/ajpheart.1981.241.4.h620
发表时间: 1981-01-01
影响因子: --
作者:
HIRSCH, JA;BISHOP, B
通讯作者: BISHOP, B
高碳酸血症和缺氧刺激气管缓慢适应牵张感受器。
DOI: 10.1016/0034-5687(83)90123-8
发表时间: 1983
期刊: Respiration physiology
影响因子: --
作者:
Fisher,JT;Sant'Ambrogio,FB;Sant'Ambrogio,G
通讯作者: Sant'Ambrogio,G